Fixed error guessing in blocks in a child template

lib/Twig/Template.php

@@ -155,6 +155,17 @@ abstract class Twig_Template implements Twig_TemplateInterface
             try {
                 $template->$block($context, $blocks);
             } catch (Twig_Error $e) {
+                if (!$e->getTemplateFile()) {
+                    $e->setTemplateFile($template->getTemplateName());
+                }
+
+                // this is mostly useful for Twig_Error_Loader exceptions
+                // see Twig_Error_Loader
+                if (false === $e->getTemplateLine()) {
+                    $e->setTemplateLine(-1);
+                    $e->guess();
+                }
+
                 throw $e;
             } catch (Exception $e) {
                 throw new Twig_Error_Runtime(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, $template->getTemplateName(), $e);

test/Twig/Tests/Fixtures/exceptions/undefined_template_in_child_template.test

@@ -0,0 +1,15 @@
+--TEST--
+Exception for an undefined template in a child template
+--TEMPLATE--
+{% extends 'base.twig' %}
+
+{% block sidebar %}
+    {{ include('include.twig') }}
+{% endblock %}
+--TEMPLATE(base.twig)--
+{% block sidebar %}
+{% endblock %}
+--DATA--
+return array()
+--EXCEPTION--
+Twig_Error_Loader: Template "include.twig" is not defined in "index.twig" at line 5.